IAQVEC 2023, the 11th international conference on indoor air quality, ventilation & energy conservation in buildings, will be held in Tokyo, May 20-23, 2023. IAQVEC is short for Indoor Air Quality, Ventilation and Energy Conservation in Buildings. The conferences cover a wide range of key research areas with the goal of simultaneously improving indoor environmental quality (IEQ) and energy efficiency enhancing wellbeing and sustainability.